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arXiv 0910.2164nucl-th
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核能密度泛函理论中的单准粒子态

One-quasiparticle States in the Nuclear Energy Density Functional Theory

N. Schunck, J. Dobaczewski, J. McDonnell, J. More, W. Nazarewicz, J. Sarich, M. V. Stoitsov

摘要:

本文在Skyrme-Hartree-Fock-Bogoliubov核密度泛函理论框架下研究了稀土区的单准质子激发。在充分考虑时奇平均场的情况下,准确地实现了阻塞处方。将等填充近似与精确分块法进行了比较。我们表明,这两个程序是严格等价的时间奇通道被忽略时,并讨论如何核对齐属性影响的时间奇字段。时间奇场对计算的单准质子带头能量的影响被认为是相当小的,在100-200千电子伏的顺序,因此,相等填充近似是足够精确的最实际的应用。研究了由奇粒子引起的芯的三轴极化。我们还简要地讨论了发生有限大小的自旋不稳定性,目前在计算奇数质量核时,采用某些Skyrme泛函。

英文摘要:

We study one-quasiproton excitations in the rare-earth region in the framework of the nuclear Density Functional Theory in the Skyrme-Hartree-Fock-Bogoliubov variant. The blocking prescription is implemented exactly, with the time-odd mean field fully taken into account. The equal filling approximation is compared with the exact blocking procedure. We show that both procedures are strictly equivalent when the time-odd channel is neglected, and discuss how nuclear alignment properties affect the time-odd fields. The impact of time-odd fields on calculated one-quasiproton bandhead energies is found to be rather small, of the order of 100-200 keV; hence, the equal filling approximation is sufficiently precise for most practical applications. The triaxial polarization of the core induced by the odd particle is studied. We also briefly discuss the occurrence of finite-size spin instabilities that are present in calculations for odd-mass nuclei when certain Skyrme functionals are employed.

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